1997 Mercedes-Benz SLK MOT pass rate, common failures & what to check

In 2025, 68.9% of Mercedes-Benz SLKs first used in 1997 passed their MOT first time, against 66.9% for all cars first used in 1997. Across 2,025 SLK first tests from 2023 to 2025, the most common failure areas were lamps and electrical equipment, visibility (wipers, washers and windscreen) and brakes.

This page analyses first MOT tests for Mercedes-Benz SLKs first used in 1997 (all trims grouped): 2021 to 2025 for the pass-rate trend, and 2023 to 2025 for the failure and advisory analysis — plus what is worth checking before you buy one.

Data: DVSA anonymised MOT tests to December 2025 · Calculated by SortedCars · Updated October 2026

Passed first time, 2025
68.9%
of 575 first tests; all cars first used in 1997: 66.9%. Fixed-at-the-test counts as a fail
Tests analysed
2,025
first tests, 2023–2025; 575 in 2025
Clean pass, 2025
30.4%
of 575 first tests in 2025, passed with no advisory and no minor defect recorded
Typical mileage, tested in 2025
83,500
middle half: 60,500–111,000 miles; all cars first used in 1997: 100,000

How the 1997 Mercedes-Benz SLK MOT pass rate has changed

Share of first tests passed in each year, SLKs first used in 1997 against all cars first used in 1997 (any make or fuel; not adjusted for mileage, fuel or use). In 2025 the SLK figure was in line with the all-cars figure.

1997 SLKAll cars first used in 1997
60%70%20212022202320242025Test year (first tests)All cars first used in 1997, test year 2021: 61.4%All cars first used in 1997, test year 2022: 63.3%All cars first used in 1997, test year 2023: 64.5%All cars first used in 1997, test year 2024: 65.4%All cars first used in 1997, test year 2025: 66.9%1997 SLK, test year 2021: 66.9%1997 SLK, test year 2022: 69.3%1997 SLK, test year 2023: 68%1997 SLK, test year 2024: 66.9%1997 SLK, test year 2025: 68.9%68.9%66.9%
View this chart as a table
Test year1997 SLKAll cars first used 1997SLK first tests
202166.9%61.4%950
202269.3%63.3%900
202368.0%64.5%794
202466.9%65.4%656
202568.9%66.9%575

Common 1997 Mercedes-Benz SLK MOT failures

Share of the 650 failed first tests (2023–2025) with at least one failure in each area. A test can fail in more than one area, so the shares add up to more than 100%.

Lamps, reflectors and electrical equipment66.0%
Visibility19.8%
Brakes17.7%
Noise, emissions and leaks13.4%
Suspension12.8%
Tyres12.0%
Seat belts and supplementary restraint systems10.3%
Body, chassis, structure9.8%

Most common failure items

DVSA failure itemShare of failed first testsTests
Stop lamp: not working21.4%139
Position lamp: not working14.2%92
Headlamp aim: projected beam image is obviously incorrect10.9%71
Wipers: does not clear the windscreen effectively10.0%65
SRS malfunction indicator lamp: warning lamp indicates a fault9.1%59

Item names are DVSA’s own wording. 2023–2025 combined.

What to check on a 1997 Mercedes-Benz SLK before buying

The three areas where failed first tests most often had a fault, 2023–2025.

  1. Lamps and electrics. Ask someone to watch while you work the brake lights, indicators, sidelights, dipped and main beam, and the number-plate lamps.
  2. Wipers and windscreen. Worth checking that the wipers clear the screen cleanly, that the washers work, and that there are no chips or cracks in the driver’s view.
  3. Brakes. Worth looking at the discs and pads through the wheel spokes for scoring and a worn lip, and noticing on the test drive whether the car pulls to one side or the pedal feels long.

Common 1997 Mercedes-Benz SLK MOT advisories

Advisories are points the tester noted that did not fail the car. Most common on 1997 SLKs, as a share of all 2,025 first tests, 2023–2025.

DVSA advisory itemShare of first testsTests
Rigid brake pipes: corroded, covered in grease or other material16.4%332
Coil spring: corroded11.1%225
Tyre condition: slightly damaged/cracking or perishing11.1%224
Tread depth: worn close to legal limit/worn on edge10.6%215
Sub-frame: corroded but not seriously weakened10.3%208

Questions about the 1997 Mercedes-Benz SLK MOT

What is the MOT pass rate of a 1997 Mercedes-Benz SLK?

In 2025, 68.9% of SLKs first used in 1997 passed their MOT first time, against 66.9% for all cars first used in 1997. A car fixed during the test counts as a fail.

What does a 1997 SLK most often fail its MOT on?

Lamps and electrical equipment (in 66.0% of failed first tests, 2023–2025), visibility (wipers, washers and windscreen) (19.8%) and brakes (17.7%). The single most common item was “Stop lamp: not working” (21.4%).

How often does a 1997 Mercedes-Benz SLK fail its MOT?

In 2025, 31.1% of first tests on SLKs first used in 1997 did not pass first time: 25.6% failed, and a further 5.6% had a fault fixed during the test (counted as a fail here). Across 2023–2025, 650 of 2,025 first tests did not pass first time.

What are the most common 1997 Mercedes-Benz SLK MOT advisories?

“Rigid brake pipes: corroded, covered in grease or other material” (on 16.4% of first tests, 2023–2025), “Coil spring: corroded” (11.1%), “Tyre condition: slightly damaged/cracking or perishing” (11.1%), “Tread depth: worn close to legal limit/worn on edge” (10.6%) and “Sub-frame: corroded but not seriously weakened” (10.3%).

Is a 1997 Mercedes-Benz SLK reliable?

An MOT pass rate shows what failed at the test, not how reliable a car is. For this group of cars the first-time pass rate went from 66.9% in 2021 to 68.9% in 2025. For one particular car, its own MOT history matters more than the average.

Other cars first used in 1997

The most-tested cars from the same year. Each page uses the same method.

1997 Land Rover Defender MOT statistics · 1997 Volkswagen Transporter MOT statistics · 1997 Mazda MX-5 MOT statistics · 1997 BMW Z3 MOT statistics · 1997 BMW 3 Series MOT statistics

How the 1997 Mercedes-Benz SLK MOT data is calculated

Every number on this page is calculated by SortedCars from DVSA’s anonymised MOT test data for Great Britain, 2021–2025. “1997 SLK” means a Mercedes-Benz SLK whose date of first use falls in 1997 (P and R plates), all trims grouped. Class 4 vehicles, first tests only — retests are not counted. Pass rate = passed ÷ all first tests; a car with a fault fixed during the test (PRS) counts as a fail. Our national first-test pass rate matches DVSA’s published figure (table DVSA/MOT/01) to within 0.04 points in every year. Clean pass = passed with no advisory and no minor defect recorded. Mileage is the reading recorded at the test. Comparisons are with all cars first used in 1997, any make or fuel, and are not adjusted for mileage, fuel or use. Failure and advisory item names are DVSA’s own wording. No figure is shown for fewer than 500 tests; an item is shown only if it appears on at least 50 tests and 1% of the base. Pass rates describe a group of cars, not one car: a well-kept example can pass and a neglected one can fail. This page is general information, not advice about any particular vehicle; always have a used car inspected before you buy. SortedCars is not affiliated with or endorsed by DVSA. You can check any car’s MOT history free on the official service: gov.uk/check-mot-history. Contains public sector information licensed under the Open Government Licence v3.0.